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고분자 재료의 온도별 인장 및 피로수명 특성에 대한 연구
서형주(Hyoung-Joo Seo),이억섭(Ouk-Sub Lee) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
Recently, the automotive vehicle is required to reduce the weight according to the demand of higher fuel efficiency and environmental pollution control. So the proportion of polymers is increasing in the automotive vehicle components. This study was designed to propose empirical relationships of tensile and fatigue life with varying temperatures. PA66+PPE alloy was used for experimental specimens. The tensile and fatigue characteristics were investigated for each experimental condition with 3~5 specimens. The tensile test results were used to formulate empirical equations to predict the elastic modulus and tensile strength at varying temperatures. The fatigue test results were also used to provide an experimental S-N curve equation at varying temperatures. In addition, fracture surfaces of test specimens were briefly examined by optical microscope and SEM.
원지혜(Ji-hye Won),이상교(Sang-kyo Lee),이흥식(Heung-shik Lee),최은영(Eun-young Choi),조종두(Chongdu Cho),서형주(Hyoung-joo Seo),김성담(Seong-dam Kim),세오히로유키(Seo Hiroyuki),김영길(Young-gil Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
In this study, wire, bundle and ass’y level of the wire harness system are investigated for the fatigue life prediction using both finite element method (FEM) and experimental analysis. To obtain stress-life (S-N) histories of the componential wires of the system, wires are prepared and applied repeated bending motion using developed fatigue life equipment. Equivalent model of the wire from rule of mixture theory is used for the simplification of the analysis. Contact conditions among the wires, taping conditions, optimized composition of wires, effects of the number of wires in the bundle are derived through the bundle level test and bundle numerical analysis. Wire and bundle level results are adopted for the ass’y level analysis. For the ass’y level analysis, real wire harness system including bundle and grommet is numerically modeled and applied contact condition between wire and grommet with real opening motion. As a result, we was able to shorten development time by developing the simulation methodology for wire harness reliability using the FEM in the early stages of wire harness development..
불확정성 개념을 적용한 전자도서관 공간구성에 관한 연구
서형주,김억 대한건축학회 2001 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.21 No.2
Today's Electronic age has rapidly progressed and brought up the mass information system due to computer networks. With this background. The meaning of Indeterminacy and its analysis are being considered very highly by its rise of the virtual age. The purpose of this study is to define the concept of Indeterminacy, acknowledge the aspect based on this definition and compose the spatial program of the Digital Library with this result.